FI59279B - LAMINARAD PAPERPRODUKT SAMT FOERFARANDE FOER TILLVERKNING AV DENNA - Google Patents

Description

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Patent and Register Held (4 * NthtMMmen,

Patent och registerstyreisen 'Ameiun uA * d och utUkHftm pubitcend 31.03.81 (32) (33) (31) Pyy4 * ttjr «« ι · Μ ·· μ »—a« g * rd prtorftet 2k. 10.73

Sweden-Sverige (SE) 1 ^ 3976/73 (71) A.B. Akerlund & Reusing, Fack, 221 01 Lund, Sweden-Sweden (SE) (72) Stig Ekstrand, Lund, Sweden-Sweden (SE) (7 * 0 Oy Kolster Ab (5IO Laminated paper product and its production method - Laminerad pappers-produkt samt This invention relates to a laminated paper product comprising a layer of porous paper and a layer of a plastic material, e.g. polyethylene or polypropylene. otherwise, the invention can, of course, also be used for many other purposes.

The product according to the invention is characterized in that the adhesion between the two layers varies, preferably with varying parts with good adhesion between the two layers and parts without adhesion between them, while the paper is so porous that stiffening air cushions cannot be form between two layers.

The parts with good adhesion preferably form a line-like pattern, whereby the lines in the web-like material can be arranged in its longitudinal direction, in the transverse direction and / or diagonally. Straight and / or e.g. sinusoidally curved lines can then be located parallel and evenly spaced. However, the parts with good adhesion can alternatively form a dot pattern with regularly formed dots, the total surface area of which then preferably occupies only a smaller part of the total surface of the product, e.g.

If the so-called tissue quality, i.e. porous paper grade with a basis weight of 15-50 grams / m has been shown to give a product that bends very softly, e.g. over the edge of a table, when used as a tablecloth. For such use, polyethylene is preferably selected for the plastic layer. If, on the other hand, the product has to be used, for example, as a disposable sheet during surgery, it must withstand sterilization. In this case, a polypropylene or similar plastic material which withstands a higher temperature without melting is preferably used.

The invention also relates to a method of manufacturing the product described above, in which a porous paper web is fed into a press between two rolls, where it is joined to an extruded plastic film. This method is characterized in that the paper web and the plastic film are pressed together only within limited areas using a smooth roll and a profiled roll as said two rollers.

Practical experiments have then shown that the effective surface of the profiled roll must be coated with silicone to prevent the plastic from penetrating through the paper layer.

The invention will now be described in more detail with reference to the accompanying drawings, which schematically show the apparatus with which the method according to the invention is implemented and the rollers used in connection therewith.

Figure 1 then shows an example of an apparatus by means of which the method according to the invention can be implemented; Fig. 2 shows a longitudinal view of the press roll included in the apparatus of Fig. 1; Figures 3b and 3b show longitudinal and end views, respectively, of an alternative embodiment of a press roll: Figures 4 and 5 show longitudinal views of two other alternative embodiments of a press roll; Figures 6 and 7 finally show an example of a product made by means of the press roll according to Figure 2.

When the device according to Fig. 1 has to be used to implement the invention, the first material web 1 is fed into the compression between the compression roll 2 and the cooling roll 3. Substance 1 is preferably the so-called a tissue-grade paper layer, i.e. porous paper quality with a basis weight of 15-50 gr / m.

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At the same time, a plastic film 4 is extruded from the extruder 5. In order to prevent this plastic film 4 from being completely pressed into the porous paper web 1, it is first brought into contact with the cooling roll 3 before being introduced into the press between the rolls 2,3. The path formed by the paper layer 1 and the plastic film 4 is then fed over the rotating roller 6 and further to a conventional winding station (not shown). The compression roll 2, alternative embodiments of which are shown in Figures 2-5, is preferably a metal roll, the vertical parts of which are provided with a thin silicone coating. Practical experiments have shown that a suitable thickness of this coating is about 7mm. The cooling roller 3, on the other hand, is preferably smooth, shiny or matt, e.g. a sandblasted metal roller.

The press roll 2 shown in Fig. 2 is made by turning the circumferential grooves 7 on its surface. Ribs 8 are thus formed between the grooves 7. At the points where these ribs 8 press against the cooling roll 3 of the paper layer 1 and the plastic film 4, the plastic layer 4 is caused to penetrate partially inside the paper layer, whereby good adhesion is obtained. Directly opposite the grooves 7, i.e. between the ribs 8, no or very little adhesion is obtained.

Thus, Figures 3a and 3b show an alternative embodiment of the press roll. In this roller 2a, the circular grooves 7 are replaced by a helical thread And. · However, the operation of the roller is the same, except that a second pattern is obtained between the parts with and without adhesion.

In the embodiment of Figure 4, reference 2b indicates a press roll. Here, the grooves 7 ^> · corresponding to the grooves 7a, on the other hand, are replaced by point-like protrusions 8b with a square top surface. Parts with good adhesion are thus in a point pattern in the finished product.

In the embodiment of the press roll 2c shown in Fig. 5, the regular pattern of Fig. 4 has been replaced by a more irregular pattern formed by the point-like protrusions 8c. It is shown here on a five-sided top surface. However, one skilled in the art will appreciate that its shape can vary widely.

Figures 6 and 7 finally show an example of a product made in the apparatus of Figure 1 by means of a press roll according to Figure 2. Here it is shown somewhat exaggerated how the parts 9 »with little or no adhesion (shaded in Fig. 7) vary with the parts 10 where the adhesion is good. As can be seen from the above, a certain penetration of the plastic layer 4 into the paper layer 1 is achieved in the parts 10. However, this is not shown in Fig. 6 for simplicity.

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Of course, the invention is not limited only to the embodiments described above, but can be modified within the limits set by the appended claims. For example, the method according to the invention can be applied in many different extrusion plants. In addition, for example, with slightly denser paper grades, the silicone-coated compression roll 2 can be replaced by a conventional rubber roll. The pressure between the two rollers 2 and 3 can also be changed. In principle, however, a lower total pressure must be used than with two smooth rollers. In practice, moreover, it has proved suitable to calculate the specific surface pressure between the two rollers slightly more than would be necessary only in view of the limited surface contact. In this case, surface pressures of about $ 50-90 are used in conventional burst coating at normal pressure. Nevertheless, it has been shown that semi-flowable plastic is caused to penetrate a very porous layer of paper.

5 59279 For use in the manufacture of paperboard products, in the manufacture of paper and paperboard and in the manufacture of plastic materials other than polyethylene or polypropylene. The products are not intended to be used in the manufacture of the following materials, which may be used in addition to the materials used in the manufacture of the manganese material.

The product is intended to be used as a means of transport, in which case the parts of the paper are not to be used as a means of transport, as the case may be, but not limited to

The partition with the image of the image is heated to a line shape, the colors of the line are used to form the material in the form of an anchorage and a diagonal measurement. Raka och / eller i exempelvis sinusform krökta linjer kan härvid vara anordnade parallella och med jämna mellanrum. Alternatively, a part of the dock with the aid of a medium-sized bunker with a for-made hopper, a vigorous molten dagger can be used for all of its products, ie ex 5-50%.

Använder man för pappersskiktet en sk tissue-kvalitet, dvs en porös papperskvalitet med en ytvikt av 15 ~ 50 gram per square meter, hart visat sig att man erhäller en product som mycket mjukt viker sig exempelvis över kanten av ett bord, när den användes som bordsduk. For this purpose, the outer polyethylene of the plastic sticks is used. Skall däremot produkten användas säsom exempelvis engängs-lakan i samband med operationer, mäste den kunna täla sterilisering. The dyes are made of warm polypropylene or liquid plastic material which is at a high temperature after heating.

The transfer can be carried out for the production of the product, the color of which is in the form of a porous cardboard and which can be pressed into a roll and made of extruded plastic film. Detta förfarande kännetecknas av att pappersbanan och plastfilmen sammantryckes self inom begränsade omräden genom att man säsom nämnda bäda valsar väljer en siat Vals och en profilerad Vals.

Praktiska försök har härvid visat att den profilerade valsens verksamma yta bör Vara silikonbelagd för att förhindra fastklibbning av eventuell genom pappersskiktet genomträngande plast.

The aid is granted on a case-by-case basis in the form of a contract, which is a schematic of the application of the application of the aid scheme and the aid is granted.

Fig. 1 shows viscous grains that are exempted from the same, with a view of the operation of the feeder.

Fig. 2 shows a slope of the opening according to Fig. 1.

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Fig. 3 and Fig. 3 are visually and competitively and alternative to the use of press rolls.

Figures 1 and 5 show a slope of the alternating press form of the press roll.

Figures 6 and 7 show the release of the product from the press roll of Figure 2.

In particular, Figure 1 is used to test the use of the material in the case of the material 1 and in the case of the material 3. In the case of the paper material 1, the paper is of the same quality 15 20 grams per square meter. The extruder is also extruded from a plastic film U from an extruder 5. For the purpose of the plastic film, in which case the extruder and the extruder 5 are used. and for the purposes of the papers. The paper is coated with 1 or more plastic film and then the banana mat is sedan over and under the bridge for 6 or more years at a conventional upstairs station (icke visad). The press roll 2, for which an alternative forming mold is shown in Figures 2-5, is preferably heated to a metal roll, the upper part of which is silicone-free. Praktiska försök har härvid visat att en tjocklek pä cirka 7 mm är warmplig för denna beläggning. Kylvalsen 3 däremot utgöres warmplen av en slat blank eller en Matt t ex sandblästrad metallvals.

In Fig. 2, the press roll 2 of the genome of the periphery of the peripheral region 7 is unused. The name of the person referred to in Article 7 is 8.

Där dessa rillor 8 trycker pappersskiktet 1 och plastfilmen b mot kylvalsen 3 bringas plastskiktet 1 delvis att tränga in i pappersskiktet, varigenom en god vid-häftning erhälles. Mittför spären 7, dvs mellan rillorna 8 erhäller man ingen eller mycket ringa vidhäftning.

Figures 3 and 3b are all alternatively adapted for press rolling.

In this case, in the case of batches of 2 and 7, the roll-over function is set to a maximum of 7 minutes.

In the form of a form according to figure U, in which a press roll of 2 is shown, the form of a form of the head is shown in Figures 7 to 7. The competent authorities for the products in question are in the format of the part with the right of way.

In the case of Fig. 5, it is possible to use a press roll as defined in Fig. 2, the arrangement being shown in Figs. All of these are available.

For the purposes of the docking station, the shape of the headform can be varied in terms of quality.

Figures 6 and 7 show that the product is shown in the form of a label

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τ 59279 av pressvalsen enligt fig. These frameworks may be used for the purposes of paragraph 10 and not all of the intrinsic plastics and papermakers.

In addition, the nature of the aid may be determined by means of an additional certificate, which may vary according to the nature of the patent. Exempelvis kan förfarandet enligt uppfinningen tillämpas i Manga olika slag av extruderingsanläggningar. Vidare kan man vid exempelvis nägot tatare papperskvali-Teter ersätta den silikonbelagda pressvalsen 2 med en konventionell gummivals. Trycket mellan de bäda valsarna 2 och 3 kan även varieras. I princip bör dock ett mindre totaltryck användas än vid användning av tvä släta valsar. In practice, the use of the same type of fuel is determined by the specific nature of the field of view of the type of fuel used by the tanker at the end of contact. Företrädesvis användes härvid ett yttryck pä cirka 50-90% av vad som är brukligt vid conventional extrudersbeläggning. However, it is possible for this purpose to be followed by an intrusion of plastics into the papers.

Claims (6)

A method of making a laminate comprising a layer of porous paper web and a thermoplastic material, wherein the porous paper web and the plastic layer are joined together to form a soft-folding laminate spaced apart from each other, characterized in that the thermoplastic material is extruded onto a web the paper web is applied to an extruded thermoplastic layer on a chill roll, and that the porous paper web and plastic layer are passed between the chill roll and a rotating, profiled roll that compresses the porous paper web and plastic layer together to prevent significant migration of the plastic material through the paper web at said spaced In the Seville regions, but at the same time the cooling is such as to allow a partial penetration of the extruded plastic layer into the paper web to provide said joint along spaced regions. Method according to Claim 1, characterized in that the profiling is carried out in such a way that the spaced-apart areas are parallel, spaced-apart lines which run in the longitudinal direction of the laminate web. Method according to Claim 1, characterized in that the profiling is carried out in such a way that the spaced regions are parallel, spaced lines running in the transverse direction of the laminate web. Method according to Claim 1, characterized in that the profiling is carried out in such a way that that the spaced apart regions are a pattern formed by spaced apart lines running in the transverse and longitudinal directions of the laminate web. A method according to claim 1, characterized in that the profiling is performed in such a way that the spaced regions are lines running diagonally across the laminate web. A method according to claim 1, characterized in that the profiling is performed in such a way that the spaced apart regions comprise several distinct and precise regions on the laminate, the total area of said regions being about 5 ~ 50% of the total surface area of the laminate. A method according to claim 1, characterized in that the profiled roll is provided with a layer of silicone to prevent any plastic material which may have penetrated through the porous paper from adhering to the profiled roll.